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  • Shown here is the rediole array of a Metavermilia inflata polychaete worm. Radioles are the ciliated feather-like tentacles that sessile polychaete worms such as these use for filter-feeding and respiration. The ball is the worm’s operculum, which seals the end of the tube when the animal retracts its radioles. The worm has just defecated, poop visible coming out of the central tube.
    metavermilia-inflata-polychaete-worm...tif
  • These feathery structures are modified<br />
prostomial palps (mouth appendages) of Spirobranchus giganteus  polychaete worms. These spiral radioles are lined with cilia and are used by the worm for feeding and breathing. The circular structure in the foreground is the operculum, which the worm uses to seal its burrow.
    spirobranchus-giganteus-christmas-tr...tif
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Tony Wu Underwater Photography

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